EXHIBIT 10(j)

                          KEYBANK NATIONAL ASSOCIATION

                                  CONFIRMATION

Date: June 9, 1998

To:   Core Materials Corporation
      Kevin Barnett

From: KeyBank National Association

The purpose of this letter agreement is to set forth the terms and conditions of
the Swap Transaction entered into between KeyBank National Association ("Key")
and Core Materials Corporation ("Counterparty") on the Trade Date specified
below (the "Swap Transaction"). This letter agreement constitutes a
"Confirmation" as referred to in the Swap Agreement Specified below.

         1. The definitions and provisions contained in the 1991 ISDA
Definitions (as published by the International Swap Dealers Association, Inc.)
(the "Definitions") are incorporated into this Confirmation.

              If you and we are parties to a Master Agreement that sets forth
the general terms and conditions applicable to Swap Transactions between us (a
"Swap Agreement"), this confirmation supplements, forms a part of, and is
subject to, such Swap Agreement. If you and we are not yet parties to a Swap
Agreement, this Confirmation will supplement, form a part of, and be subject to,
a Swap Agreement upon its execution and delivery by you and us. All provisions
contained or incorporated by reference in such Swap Agreement shall govern this
Confirmation except as expressly modified below. In the event of any
inconsistency between this Confirmation and the Definitions or the Swap
Agreement, this Confirmation will govern. In addition, if a Swap Agreement has
not been executed, this Confirmation will itself evidence a complete binding
agreement between you and us as to the terms and conditions of the Swap
Transaction to which this Confirmation relates.

              This Confirmation will be governed by and construed in accordance
with the laws of the State of New York, without reference to choice of law
doctrine, provided that this provision will be superseded by any choice of law
provision in the Swap Agreement.

<PAGE>

Core Materials Corporation
Confirmation - Page 2

         2. This Confirmation constitutes a Rate Swap Transaction under the Swap
Agreement and the terms of the Rate Swap Transaction to which this Confirmation
relates are as follows:

<TABLE>
<S>                                        <C>
Notional Amount:                           $7,500,000 amortizing per attached
                                           Schedule A

Trade Date:                                June 9, 1998

Effective Date:                            June 11, 1998

Termination Date:                          April 1, 2013

Fixed Amounts:

       Fixed Rate Payer:                   Counterparty

       Fixed Rate Payer
       Payment Dates:                      January 1, April 1, July 1 and
                                           October 1 of each year commencing
                                           with July 1, 1998 through and
                                           including the Termination Date,
                                           subject to adjustment in accordance
                                           with the Following Business Day
                                           Convention.

       Fixed Rate:                         4.89%

       Fixed Rate Day
       Count Fraction:                     Actual/365

Floating Amounts:

       Floating Rate Payer:                Key

       Floating Rate Payer
       Payment                             Dates: January 1, April 1, July 1 and
                                           October 1 of each year commencing
                                           with July 1, 1998 through and
                                           including the Termination Date,
                                           subject to adjustment in accordance
                                           with the Following Business Day
                                           Convention.
</TABLE>

<PAGE>

Core Materials Corporation
Confirmation - Page 3

<TABLE>
<S>                                        <C>
       Floating Rate for
       initial Calculation
       Period:                             TBD

       Floating Rate Option:               76% of USD-CP-H.15

       Designated Maturity:                30 day

       Spread:                             None

       Floating Rate Day
       Count Fraction:                     Actual/365

       Reset Dates:                        Daily, Unweighted Average

Calculation Agent:                         KeyBank National Association

Payment Instructions:                      Core Materials Corporation at KeyBank
</TABLE>

Please confirm the foregoing correctly sets forth the terms of our Agreement by
executing the copy of this Confirmation enclosed for that purpose and returning
it to us.

                                              Very truly yours,

                                              KEYBANK NATIONAL ASSOCIATION

                                              By: /s/ Michelle Loschiavo
                                                 ------------------------

Accepted and Confirmed as
of the Trade Date:

CORE MATERIALS CORPORATION

By: /s/ Kevin L. Barnett
   ----------------------
<PAGE>

Core Materials Corporation
Confirmation - Page 3

                                   SCHEDULE A

$7,500,000  amortizing as follows:

<TABLE>
<CAPTION>
  Period                    Period
Start Date                 End Date               Notional            Amortization
----------                 --------               --------            ------------
<S>                        <C>                  <C>                   <C>
11-Jun-98                  1-Jul-98             $ 7,500,000             $  65,000
 1-Jul-98                  1-Oct-98             $ 7,435,000             $  65,000
 1-Oct-98                  1-Jan-99             $ 7,370,000             $  70,000
 1-Jan-99                  1-Apr-99             $ 7,300,000             $  70,000
 1-Apr-99                  1-Jul-99             $ 7,230,000             $  70,000
 1-Jul-99                  1-Oct-99             $ 7,160,000             $  75,000
 1-Oct-99                  1-Jan-00             $ 7,085,000             $  75,000
 1-Jan-00                  1-Apr-00             $ 7,010,000             $  75,000
 1-Apr-00                  1-Jul-00             $ 6,935,000             $  75,000
 1-Jul-00                  1-Oct-00             $ 6,860,000             $  80,000
 1-Oct-00                  1-Jan-01             $ 6,780,000             $  80,000
 1-Jan-01                  1-Apr-01             $ 6,700,000             $  80,000
 1-Apr-01                  1-Jul-01             $ 6,620,000             $  85,000
 1-Jul-01                  1-Oct-01             $ 6,535,000             $  85,000
 1-Oct-01                  1-Jan-02             $ 6,450,000             $  85,000
 1-Jan-02                  1-Apr-02             $ 6,365,000             $  90,000
 1-Apr-02                  1-Jul-02             $ 6,275,000             $  90,000
 1-Jul-02                  1-Oct-02             $ 6,185,000             $  90,000
 1-Oct-02                  1-Jan-03             $ 6,095,000             $  95,000
 1-Jan-03                  1-Apr-03             $ 6,000,000             $  95,000
 1-Apr-03                  1-Jul-03             $ 5,905,000             $ 100,000
 1-Jul-03                  1-Oct-03             $ 5,805,000             $ 100,000
 1-Oct-03                  1-Jan-04             $ 5,705,000             $ 100,000
 1-Jan-04                  1-Apr-04             $ 5,605,000             $ 105,000
 1-Apr-04                  1-Jul-04             $ 5,500,000             $ 105,000
 1-Jul-04                  1-Oct-04             $ 5,395,000             $ 110,000
 1-Oct-04                  1-Jan-05             $ 5,285,000             $ 110,000
 1-Jan-05                  1-Apr-05             $ 5,175,000             $ 110,000
 1-Apr-05                  1-Jul-05             $ 5,065,000             $ 115,000
 1-Jul-05                  1-Oct-05             $ 4,950,000             $ 115,000
 1-Oct-05                  1-Jan-06             $ 4,835,000             $ 120,000
 1-Jan-06                  1-Apr-06             $ 4,715,000             $ 120,000
 1-Apr-06                  1-Jul-06             $ 4,595,000             $ 125,000
 1-Jul-06                  1-Oct-06             $ 4,470,000             $ 125,000
 1-Oct-06                  1-Jan-07             $ 4,345,000             $ 130,000
 1-Jan-07                  1-Apr-07             $ 4,215,000             $ 130,000
 1-Apr-07                  1-Jul-07             $ 4,085,000             $ 135,000
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
  Period                    Period
Start Date                 End Date               Notional              Amortization
----------                 --------             ------------            ------------
<S>                        <C>                  <C>                     <C>
 1-Jul-07                  1-Oct-07             $  3,950,000             $  135,000
 1-Oct-07                  1-Jan-08             $  3,815,000             $  140,000
 1-Jan-08                  1-Apr-08             $  3,675,000             $  145,000
 1-Apr-08                  1-Jul-08             $  3,530,000             $  145,000
 1-Jul-08                  1-Oct-08             $  3,385,000             $  150,000
 1-Oct-08                  1-Jan-09             $  3,235,000             $  150,000
 1-Jan-09                  1-Apr-09             $  3,085,000             $  155,000
 1-Apr-09                  1-Jul-09             $  2,930,000             $  155,000
 1-Jul-09                  1-Oct-09             $  2,775,000             $  160,000
 1-Oct-09                  1-Jan-10             $  2,615,000             $  165,000
 1-Jan-10                  1-Apr-10             $  2,450,000             $  165,000
 1-Apr-10                  1-Jul-10             $  2,285,000             $  170,000
 1-Jul-10                  1-Oct-10             $  2,115,000             $  175,000
 1-Oct-10                  1-Jan-11             $  1,940,000             $  175,000
 1-Jan-11                  1-Apr-11             $  1,765,000             $  180,000
 1-Apr-11                  1-Jul-11             $  1,585,000             $  185,000
 1-Jul-11                  1-Oct-11             $  1,400,000             $  190,000
 1-Oct-11                  1-Jan-12             $  1,210,000             $  190,000
 1-Jan-12                  1-Apr-12             $  1,020,000             $  195,000
 1-Apr-12                  1-Jul-12             $    825,000             $  200,000
 1-Jul-12                  1-Oct-12             $    625,000             $  205,000
 1-Oct-12                  1-Jan-13             $    420,000             $  210,000
 1-Jan-13                  1-Apr-13             $    210,000             $  210,000
</TABLE>